Add new server modules and configurations for various services

- Introduced `default-creds` module for managing default credentials with Umami integration.
- Added `fail2ban` module for brute-force attack protection with configurable ban times.
- Created `firewall` module to enable and configure basic firewall settings.
- Implemented `gitea` module for self-hosted Git service with PostgreSQL backend.
- Developed `glance` module for a customizable dashboard with various widgets and themes.
- Added `iknowyou` module for a self-hosted password manager with production and demo environments.
- Introduced `kernel-hardening` module for enhancing kernel security settings.
- Created `mazanoke` module for a simple web application with Nginx integration.
- Added `mealie` module for a self-hosted meal planning application.
- Implemented `stirling-pdf` module for PDF generation service.
- Developed `umami` module for self-hosted analytics with secret management.
- Added `ssh` module for secure SSH configuration with user restrictions.
- Introduced `nixy` theme for a customized aesthetic experience across services.

nixos/fonts.nix

@@ -0,0 +1,26 @@
+# Fonts configuration for NixOS
+{pkgs, ...}: {
+  fonts = {
+    packages = with pkgs; [
+      roboto
+      work-sans
+      comic-neue
+      source-sans
+      comfortaa
+      inter
+      lato
+      lexend
+      jost
+      dejavu_fonts
+      noto-fonts
+      noto-fonts-cjk-sans
+      noto-fonts-color-emoji
+      nerd-fonts.fira-code
+      nerd-fonts.meslo-lg
+      openmoji-color
+      twemoji-color-font
+    ];
+
+    enableDefaultPackages = false;
+  };
+}